稻細蟎寄主範圍之調查

Abstract

調查稻田及其附近之雜草17科52屬73種，其中37種為禾本科皆未發現稻細蟎生存繁殖其上；又調查休閒田土壤及再生稻根部土壤中之蟎類，亦未發現稻細蟎。以6種水稻主要病害之病原真菌及4種土壤中之真菌飼育稻細蟎，皆不能生存繁殖，故稻細蟎之食性似頗為專一。 Seventy-three species of weeds belonging to17 plant-families in and nearby paddy fieldswere investigated during 1977 and 1978. Noneof them was found to be the host of the ricetarsonemid mite, Steneotarsonemus spinki Smiley.A number of species of mites were found insoil samples collected tfrom idle fields and theroot part of ratoon rice, but no rice tarsonemidmite wasfound there. No rice tarsonemid mitesurvived on 10 different species of funguscultures on PDA medium. It was assumed thatthe food of rice tarsonemid mite was restrictedonly to the rice. The damage and loss caused by ricetarsonemid mite to rice plants may be delayedand decreased to the minimum by the followingways: 1. Destruction of the whole ratoon rices and stubbles to keep rice tarsonemid mite out of their food. 2. To synchronize the cultivation of rice plants. 3. To fallow tfie paddy field for a proper period of time (about 2 wks) after the harvest of the first crops.